'165 switching both fans from the ECM?

[Shannen Durphey]

Somehow, I just knew you didn't want to do things the easy way. : ) 
Well, I'm looking at the ecm pinouts for an 89 F car, and it appears
that the ecm controls 2 fans.  The vettes are similar, but I won't
swear that the wiring is the same.  Pin C1 is for the primary fan, pin
D11 controls the secondary fan.  D11 is wired in parallel with a temp
switch in the cylinder head.

Since you haven't mentioned it yet, are you using this in a v6 car, or
an 8 cyl?  Worst case, use one relay to control 2.  It's kind of
kludgy, but it will definitely work.
Shannen

Kevin Crain wrote:
> 
> Thanks Shannen.  I had a note on GM part# 3053190 switch for Buick Regal
> T-type VIN 7.  Supposedly this switch is set up to close at 200 & open at
> 185.  I figure on calling the local GM dealerships tomorrow to see if one
> can be found.
> 
> Doing all this on the ECM would be much slicker, tho.  This would let me
> change software for cold weather use and dial up the fan-on temps, no messy
> coolant-in-the-hair switch changeouts needed for track setup.
> 
> -Kevin
> 
> At 09:10 PM 5/26/00 -0400, you wrote:
> >FWIW, the fan switch from a 1983 Cavalier can be used to replace the
> >current aux. fan switch, and it closes at 212 degrees F.
> >Shannen
> >
> >Kevin Crain wrote:
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